Interestingly we use a Hu 369D for Moorland restoration. Over past 11 years we have moved 75000 dumpy bags anything from single to 6's so one can imagine the number of lift cycles, Had no more than a handful of static belts ! Seems to happen when there is moisture in the air in particular snow. Just come back from 10 days and over 1100 cycles, ground crew who catch the hook didnt have any belts